You can't set the Humanoid RootPart of a Player Character anymore

Bug Reports Engine Bugs
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Since the change that added physics controllers for characters (I think), the behaviour of humanoids has changed. The dev hub states that the RootPart of a player’s Humanoid is the same as the PrimaryPart of the players character. Humanoid | Documentation - Roblox Creator Hub

This is no longer the case. You can’t set the RootPart anymore, and the humanoid can just decide to pick another rootpart if something about the rootpart changes (ie you change the name of the rootpart.) I relied on being able to set the character’s rootpart but now I no longer can, which causes issues in my game.

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This is working fine, you’re likely doing something weird, or you have a different setup than the obvious one (raw humanoid). Note that bug reports require a repro file for a reason. As a workaround you could try setting the root priority of your characters’ rootparts higher and see if that affects the issue.

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Hello, could you share a file or set of steps to reproduce this? Otherwise we may need to close this if we can’t find a way to trigger it ourselves. Thank you!

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I’m currently having this issue. The RootPart property of the humanoid only seems to be initialized when the the desired part is named “HumanoidRootPart”. Renaming it to anything else results in the property being set to nil even if the model’s primary part is set. Did you find a fix?

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I’m not sure what you mean about it working fine, it isn’t working at all.

To reproduce: simply open a baseplate and change the PrimaryPart of your character model. The RootPart of your humanoid will not change. Also, try changing the name of your HumanoidRootPart. Watch how the humanoid will swap its RootPart to UpperTorso and you start walking weird, and you are unable to fix it by changing the character’s PrimaryPart. This used to work.

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Thanks for the report, and apologies for the delay! Sounds like there are 2 things being discussed here. First, note that the PrimaryPart of the character Model is initially set to be the HumanoidRootPart, but they are not the “same” in the sense that changing the primary part is not supposed to change the root part of the humanoid. Second, we do not currently recommend changing the name of HumanoidRootPart (see the top of Humanoid | Documentation - Roblox Creator Hub). For better or worse, some of the humanoid controller code is designed to look for the part named HumanoidRootPart, and if it is not found, wonky things can begin to happen (as you’ve seen). Hopefully that helps clear things up!