Neverending "Preparing Project data" (EDIT: not happening anymore since the last window update)

[RabloGames]

Problem description

[EDIT: This hasn't happened for more than one week, so maybe the latest Windows update fixed this]

When trying to preview the project, the editor randomly displays
"Failed to start preview.
Try reloading Construct 3 and try again."
Then "Preparing Project data" is displayed forever. without any opportunity to save the work or do anything.

Attach a .c3p

I don't have a minimal Construct project that reproduces the problem, but I can give you access to my full project in private.

Steps to reproduce

Open the project.
Press F5.
The editor randomly has the problem described.
I think this only happens when an image has been modified and "Preparing images" is displayed.

Observed result

"Preparing Images" is displayed for a while, then
"Failed to start preview.
Try reloading Construct 3 and try again."
Then "Preparing Project data" is loading forever. without any opportunity to save the work or do anything.
This happens randomly around 1 time out of 10.
Sometimes I have the problem just by opening the project and pressing F5 immediately.

Expected result

The editor should preview correctly the projet, or at the very least let me save my project!
Currently I'm losing my unsaved work everytime this happens.

More details

Affected browsers/platforms:

Happens in Chrome 131.0.6778.205
I had the problem on 2 different computers.

First affected release:
r416.2 stable
I don't think I had the problem before.

System details

View details

Platform information
Product: Construct 3 r416.2 (stable)
Browser: Chrome 131.0.6778.205
Browser engine: Chromium
Context: browser
Operating system: Windows 11
Device type: desktop
Device pixel ratio: 1.25
Logical CPU cores: 12
Approx. device memory: 8 GB
User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Language setting: en-US

Local storage
Storage quota (approx): 559 gb
Storage usage (approx): 3.3 gb (0.6%)
Persistant storage: Yes

Browser support notes
This list contains missing features that are not required, but could improve performance or user experience if supported.

Nothing is missing. Everything is OK!
WebGL information
Version string: WebGL 2.0 (OpenGL ES 3.0 Chromium)
Numeric version: 2
Supports NPOT textures: yes
Supports GPU profiling: no
Supports highp precision: yes
Vendor: Google Inc. (Intel)
Renderer: ANGLE (Intel, Intel(R) UHD Graphics (0x00009BC4) Direct3D11 vs_5_0 ps_5_0, D3D11)
Major performance caveat: no
Maximum texture size: 16384
Point size range: 1 to 1024
Extensions:

EXT_clip_control
EXT_color_buffer_float
EXT_color_buffer_half_float
EXT_conservative_depth
EXT_depth_clamp
EXT_disjoint_timer_query_webgl2
EXT_float_blend
EXT_polygon_offset_clamp
EXT_render_snorm
EXT_texture_compression_bptc
EXT_texture_compression_rgtc
EXT_texture_filter_anisotropic
EXT_texture_mirror_clamp_to_edge
EXT_texture_norm16
KHR_parallel_shader_compile
NV_shader_noperspective_interpolation
OES_draw_buffers_indexed
OES_sample_variables
OES_shader_multisample_interpolation
OES_texture_float_linear
OVR_multiview2
WEBGL_blend_func_extended
WEBGL_clip_cull_distance
WEBGL_compressed_texture_s3tc
WEBGL_compressed_texture_s3tc_srgb
WEBGL_debug_renderer_info
WEBGL_debug_shaders
WEBGL_lose_context
WEBGL_multi_draw
WEBGL_polygon_mode
WEBGL_provoking_vertex
WEBGL_stencil_texturing
Audio information
System sample rate: 48000 Hz
Output channels: 2
Output interpretation: speakers
Supported decode formats:

WebM Opus (audio/webm;codecs=opus)
WebM Vorbis (audio/webm;codecs=vorbis)
MPEG-4 Opus (audio/mp4;codecs=opus)
MPEG-4 AAC (audio/mp4;codecs=mp4a.40.2)
MP3 (audio/mpeg)
FLAC (audio/flac)
PCM WAV (audio/wav;codecs=1)
Supported encode formats:

WebM Opus (audio/webm;codecs=opus)
MPEG-4 Opus (audio/mp4;codecs=opus)
MPEG-4 AAC (audio/mp4;codecs=mp4a.40.2)
Video information
Supported decode formats:

WebM AV1 (video/webm;codecs=av01.0.00M.08)
WebM VP9 (video/webm;codecs=vp9)
WebM VP8 (video/webm;codecs=vp8)
MPEG-4 AV1 (video/mp4;codecs=av01.0.00M.08)
MPEG-4 H.265 (video/mp4;codecs=hev1.1.2.L93.B0)
MPEG-4 H.264 (video/mp4;codecs=avc1.420034)
Supported encode formats:

WebM AV1 (video/webm;codecs=av01.0.00M.08)
WebM VP9 (video/webm;codecs=vp9)
WebM VP8 (video/webm;codecs=vp8)
WebM H.264 (video/webm;codecs=avc1.420034)
MPEG-4 AV1 (video/mp4;codecs=av01.0.00M.08)
MPEG-4 VP9 (video/mp4;codecs=vp9)
MPEG-4 H.264 (video/mp4;codecs=avc1.420034)

[AshleyScirra]

As the author notes this appears to have stopped happening, and the original issue lacked enough information to investigate anyway, closing.