SQM broken on latest snapshot

hey,
on latest snapshot sqm no longer works for me:

Tue Mar 31 14:24:38 2020 user.notice SQM: Using generic sqm_start_default function.
Tue Mar 31 14:24:38 2020 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM root cake
Tue Mar 31 14:24:38 2020 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: Error: NLA_F_NESTED is missing.
Tue Mar 31 14:24:38 2020 user.notice SQM: ERROR: QDISC cake is NOT useable.
Tue Mar 31 14:24:38 2020 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /usr/sbin/tc qdisc replace dev TMP_IFB_4_SQM root cake
Tue Mar 31 14:24:38 2020 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: Error: NLA_F_NESTED is missing.
Tue Mar 31 14:24:38 2020 user.notice SQM: ERROR: QDISC cake is NOT useable.

ZyXEL NBG6617
OpenWrt SNAPSHOT r12776-437eb41f23