[FIXED] [SD] No animation playing doing yoga class

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Often (50% - 99%)
What is your current game version number? n/a
What expansions, game packs, and stuff packs do you have installed? All of them
Steps: How can we find the bug ourselves? Go to any lot where there is an instructor mat, and sign up for a class when available
What happens when the bug occurs? When I sign up for a yoga class on any lot. People will gather on the mats, the instructor will do the moves, but everyone else will idly stand on their mats maybe do one move and the corpse pose at the end, but nothing else.
What do you expect to see? I expect that the sims will follow the instructors moves with varying levels of success.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure 

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This is a bug that I haven't noticed anyone else had reported. I have never used any mods that affect the wellness skill, or the yoga mats in any way. I think that it came about after a patch, but I can't tell which one.