I have two surveys that share a hosted feature service (AGOL Item ID 59ba332b1c0a43bba9285fb260361d2c). The first survey is defined like so with no fields filled other than what is shown:

The second survey is defined like so:

The second survey has the inbox enabled (no filter) but is otherwise using the default configurations.
When I collect a new Survey 1 survey, enter a value for the field in the repeater, submit the survey, open Survey 2, refresh the inbox for Survey 2, and open the survey that I just submitted, I am not able to enter data into the second repeater. It looks like this:

I've used the AppStudio Survey123 Enterprise Template to debug this and tracked it down to this being due to the repeat2_count field being undefined when Survey 2 opens. Is this a known bug? I would expect to be able to enter data for Repeat 2.