Mini sheep/goat locked door glitch

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? 1.99.264.1030
What expansions, game packs, and stuff packs do you have installed? Many. Please create a checksum number under the game version number for game content.
Steps: How can we find the bug ourselves? Use a smaller house in Henford-on-Bagley. Create mini sheep/goats for the household. Throw a majorly busy party.
What happens when the bug occurs? Mini sheep/goats will glitch through walls and doors and no longer be inside the household.
What do you expect to see? Less glitching.
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes
Did this issue appear after a specific patch or change you made to your system? No

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Guests seem to have to give a wide berth to sheep and goats, livestock have to do the same for guests. This *can result in clipping through walls. As H-on-B is a very large area and small livestock can wander off, get lost and be very difficult to find, I tend to lock the doors and pen the gardens for them.

I have a small, single storey barn style house, with a large garden area. The house has a separate front door, with a gate into the garden area, both being connected on one wall with barn doors.