Hello Konstantin,
Glad you managed to fix this issue! I did some tests and all seems to be fine now.
For what it’s worth: I found that the test case I posted in this thread works with 11.8.0 when a license is installed (License.setLicense). Apparently, this causes the bug to not appear. However, in our production code we use a license but still observe the issue (using 11.8.0). Maybe this can help you in creating a test case that demonstrates the issue in all environments, preventing regression in future releases.
Thanks again,
Niels