Crash in the Nested repeats for audit form while removing an empty inner repeat

[dbemke]

ODK Collect version

2023.3.1. the store version 2024.1.2, the master version 6c6c19d

Android version

10, 14

Device used

Redmi 9T, Pixel 7a

Problem description

There is a crash in the 3231 Nested repeats for audit form while removing an empty inner repeat.
 https://console.firebase.google.com/u/1/project/api-project-322300403941/crashlytics/app/a[…]ey=65DB5F0903B2000171A29DE4E04C99F0_1918010274617643865

Steps to reproduce the problem

1. Open to 3231 Nested repeats for audit form.
   3231nested-repeats-for-audit.xml.txt

2. Go to the hierarchy view.

3. Tap the arrow 4 times so that you can see outer repeat1, outer group 1, outer repeat 2.

4. Tap Outer group 1.

5. Tap the bin to remove the group (inner repeat 2).

6. In the dialog (Remove group "null” and all of its sub-groups?) tap "Remove group”.

Expected behavior

The app shouldn’t crash

[grzesiek2010]

The described section contains a repeatable (inner group) group that is wrapped into a regular group (outer group) so there are no nested repeats there.
The outer group is not repeatable so it shouldn't be even possible to try to remove it. It looks like we mistakenly treat that group as a repeatable one. Here is a much simpler form that reproduces the issue as well:
groups_crash.xlsx