That is a legit bug, then – I can try to fix that.
Out of curiosity, is there a reason you’re using the Text backend? It might be time to deprecate these, since I’m not sure of a use case that is not better covered by the standard NDAarray, if we add a .save and .load method to it.
I think the conversation was to add a deprecation warning and continue supporting backends through a 3.2 release, and then get rid of them for 3.3.