See attached screenshots. Other situations shown in MC-89428 may apply as well.
Potential code analysis by @unknown can be found in this comment.
MC-174864
Rails update other rails before checking if they are in a valid location when moved by pistons
Resolved
Duplicate
1
(Unassigned)
Confirmed
Block states, Redstone
1.15.2, 20w11a, 20w18a, 20w46a, 21w03a, , 21w07a, 21w14a, 22w15a, 1.19.2, 22w44a
Retrieved
Affects 20w46a