Hey,
I have a bot in which one topic is showing an error in the topic list. As shown below:

However, when I am inside that topic, no error is visible anywhere.

This invisible error is preventing me from publishing the bot

Does anyone have any idea what can cause this and how I could find out what the error in question would be?
I have a rather strict deadline on publishing this and this one has got me completely stumped. I already had to rebuild three topics earlier due to different bugs related to removing a "topic variable (returns values to original topic)" from a linked topic, so kind of behind schedule due to thing outside of my control.