Confirmed in 1.17.41. Also after relog experience balls will disperse normally.
This bug is suspected to have been fixed in 1.17.41, following the reproduction method, up to Y level 11,2673, and no problem was found.
Add: During my test, I found that during the ascent, it would freeze between Y level 6,0000 and 10,1000 for about 10 seconds, then it would continue to rise and slowly fall back to the ground.
Confirmed in 1.17.41.
Maybe it's related to MCPE-8758.
Maybe it's related to MCPE-16236.