Bug: Loan Summary contains zero-values after first load

[dmnk]

Describe the bug
Immediately after creating a loan, the fields "original principal" and "monthly payment" are filled with values. After navigating to another page, and returning, they stay at 0,00 €

To Reproduce
Steps to reproduce the behavior:

1. create new loan /loans/new?step=method_select
2. select "enter account balance"
3. fill the fields
4. click create accounts
5. see that rate and original principal
6. open activity tab of the loan
7. switch back to the Overview of the loan
8. (Updating the loan doesn't re-trigger the calculation as well)

Expected behavior
Have the two fields updated and calculated every time the tab is opened

What version of Maybe are you using?
This could be "Hosted" (i.e. app.maybefinance.com) or "Self-hosted". If "Self-hosted", please include the version you're currently on.
0.3, but happened with 0.2 as well. Self-Hosted.

What operating system and browser are you using?
No difference between OS and Browsers (all relevant tried)

Screenshots / Recordings
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Additional context
Add any other context about the problem here.