It appears that LoadingBufferMask is being shown for a minimum of 75 frames even if everything has finished loading in the background. To make matters worse, the space center scene has an additional 2s wait on top of that.
Note that I haven't done any actual measurements to see in which exact cases or how often this issue is materialised.
Ref: https://discord.com/channels/206181796164009984/422839886337409042/1483990493179150389