3GPP 24.501 v20.0.0 — the document's own text

7.6.4.2 Out of sequence IEs

Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).

The UE shall ignore all out of sequence IEs in a Type 6 IE container information element which are not encoded as "comprehension required" (see 3GPP TS 24.007 [11]).

The network should take the same approach.