In “compatibility options” you will need to switch to “Store fixed values”.
Then save object.
For already placed instances you will have to change any parameter and then change it back before it will stretch.
For newly place objects it should work straight up.
Don’t ask me why this is but I suspect it has something to do with the fact your hotspots use the “A” value – even though they are not changing it.
Versions 6.5 to 22
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision M6800 - i7 4700MQ @ 2.40GHz, 16GB RAM, AMD FirePro M6100 (2GB), Windows 7 64bit