It seems that at some point in the last 6 months or so, my custom installation instructions for ALL of my mods that used them have disappeared, and have since changed to the MTS default. I didn't even realize until a comment pointed this out. Is there any way for me to get these old instructions back?

UPDATE: I was able to retrieve all of my old instructions through the Wayback Machine website and re-publish them, however I am still very interested to see if it was just my account with this issue...?

I am not aware of any other issues.  Can you link me to a thread that had them wiped? (and you've now restored)

Yes of course. Here's one of my mods that had the instructions removed which I've now restored.

Here are some other examples of mods (from different creators) that should have custom installation instructions but no longer do:

https://modthesims.info/d/578691/th...eplacement.html

https://modthesims.info/d/498889/nc...g-backdrop.html