My two Euros worth 
The maps layer group are definitely gone and the illustrations layer group from pngwing.com look like they might have had an offset applied sometime, effectively gone as well.
The text is strange, using ofnuts text-info plugin, there is a lot of formatting. https://i.imgur.com/NAAXjio.jpg Usually denotes a lot of text in 'filled mode'. For a simple text layer it should look like this. https://i.imgur.com/OXmm7fJ.jpg A weird image, everything seems to have a selection, however as you found, you can get the text back by juggling the text box, one way, dynamic > fixed > dynamic works. https://i.imgur.com/a6IUMQm.mp4
It is possible to batch 'fix' (not a perfect fix, all that strange formatting remains) There is an old plugin changefont.py (attached) which works.
The text layer-group I got is here https://u.pcloud.link/publink/show?code=...JlS73rvFFk 1.4 MB
You will need to move that into position.
..if you will want to know how I got there:
about 4 minutes.
The maps layer group are definitely gone and the illustrations layer group from pngwing.com look like they might have had an offset applied sometime, effectively gone as well.
The text is strange, using ofnuts text-info plugin, there is a lot of formatting. https://i.imgur.com/NAAXjio.jpg Usually denotes a lot of text in 'filled mode'. For a simple text layer it should look like this. https://i.imgur.com/OXmm7fJ.jpg A weird image, everything seems to have a selection, however as you found, you can get the text back by juggling the text box, one way, dynamic > fixed > dynamic works. https://i.imgur.com/a6IUMQm.mp4
It is possible to batch 'fix' (not a perfect fix, all that strange formatting remains) There is an old plugin changefont.py (attached) which works.
The text layer-group I got is here https://u.pcloud.link/publink/show?code=...JlS73rvFFk 1.4 MB
You will need to move that into position.
..if you will want to know how I got there:
about 4 minutes.