I have a problem when i change from R15 to R6 in roblox studio. How can I solve it?

I had already asked this question months before and there were misunderstandings

It has been impossible for me for a long time to play in R6 in roblox studio, in the previous question yall asked me for the script but there is no script.

Even creating a new game without any script or plugin and switching to R6, the character still can't appear

Some details:

-This happens with any account

-I've completely reinstalled Roblox studio and it's not worked either

-This only happens with roblox studio

-If I publish the game and enter from the roblox app the character loads normally, this is obvious because I play minigames with R6 in roblox, but it's not practical to publish it and enter from the roblox page every time you want to try the game

-Time before, roblox was just giving me this error: Player:Move called, but player currently has no character but with the updates instead of fixing it, the character just doesn't appear without any error

-This is solved by changing computers, but it's not practical either because it's not the computer that I use

If someone happened this or knows how to solve it, I would be very helpful to explain me <3