DukeLeto7 So, uh, Hi there. Got busy with stuff, and forgot to check for a fair bit of time. But i checked in today, ran through the whole testing plan, and good news! It looks like the base sliding bug is dead, and everything explicitly stated in that test document behaved exactly as you expected.
You may have noticed that was a slightly loaded sentence however. I felt bad being late with this, so I wanted to be THOROUGH, and in the process I found some brand new bugs while doing a deep dive of everything in the Ordeal and IK castle, including one that might actually be worse than anything I have found to date.
Yaaaaaaaayyyyyyyyy.....
In descending order of severity:
Sabotaging the teleportation spells in the IK castle works fine... AFTER the barriers come down. But if it is still being guarded, you can stand next to the succubus, press W to swap parties, then interact with them while the transition is happening. If riala's party is standing just above a wall, they will walk down INTO the wall, then try and walk back up. But they get stuck in the wall, softlocking the game. This is honestly worse than the previous softlocks, as you cannot even open the menu in this state because a cut scene is still technically in progress. You have to hard-reset the game to fix this.

Riala, phased halfway into a wall
Next, you can swap parties while engaging in combat (Being able to interact with things while swapping is honestly the reason for most of these). If any combat starts with dialogue, you can initiate the swap before combat begins and whatever party is next in the rotation will fight them instead. I was able to do this for both wandering Zirantian groups in the Ordeal, and every single mid-boss in the IK castle. The optional boss dosn't have dialogue, so for that one I could not. It also does not work with the black haired succubus guarding the treasury switch, as that starts with a cut-scene that locks swapping. But any combat YOU can initiate with the use button, AND has dialogue, is susceptible.

This is supposed to be Simon's mid-boss fight, but I decided, Nah, Robin should fight instead
You can do something similar with the poisoned plants in the Ordeal. If you stand next to them with Yarra's group, swap parties, THEN interact with them, Simon's party takes the damage.
Thats all the bugs that have game play effects, these last few are visual and pretty low-priority.
In Uyae’s cutscene for getting the Ordeal Charm, the screen fades to black for a conversation between Hilastra and Yarra. You can start a party transition before engaging with the charm, and the screen will fade to black BEFORE the conversation, and unfade when Hilastra and Yarra start talking, but centered on Simon now. No game-play effect. Something similar also happens with the black haired succubus near the optional boss in the IK castle.

Yarra's voice is coming out of Simon's mouth
Finally, if you interact with the blocker to the IK Castle Throne Room, if you say "No", your party goes one block down. You can do this with all 3 parties, and wind up with all 3 in that same tile. No effect on gameplay, but probably an unintended behavior.

Robin stacked on Riala stacked on Simon. Kinky.
Sorry to dump all this on ya at once, but I hope this helps!