another problem with 2.3.36.4 after update os

[Maciej Milaszewski]

Hi
A few days ago I upgraded debian8 to debian9

dovecot is from source
# 2.2.36.4 (baf9232c1): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.24.2 (aaba65b7)
# OS: Linux 4.9.0-13-amd64 x86_64 Debian 9.13

Today I get some times in logs:
"dovecot-uidlist line 112: Invalid data" and I dont know why

This is claster dovecot:
dovecot1 - debian8
dovecot2 - debian8
dovecot3 - debian8
dovecot4 - debian9
dovecot5 - debian8
director - debian8

storage is mont via nfs
I upgrade os debian8->debian9 to one node like documentations