I noticed in the hansa.log, that it looks like default.txt is being imported on every start of the server. Am I right?
Hmm, I checked, e.g., Weeks setting has not changed during restart.

2021-04-19 18:52:58 (-1) *** Using LRU Replacement ***
2021-04-19 18:52:58 (-1) Open database HANSA.HDB
2021-04-19 18:52:58 (-1) *** using a freelist to keep track of free space ***
2021-04-19 18:52:58 (-1) *** RELOAD LANGUAGES ***
2021-04-19 18:52:58 (-1) CallHal("DoActiveLanguage")
2021-04-19 18:52:58 (-1) CallHal("OnLocalizationsMayHaveCahnged")
...
2021-04-19 18:52:58 (-1) done importing tag "company4" starting with tag "Demo", 318755 RLinks in the database