QPdfSearchModelPrivate::doSearch warning "not found in context" happens sometimes

Reproduced locally with my 2201.02089.pdf file which came from https://arxiv.org/pdf/2201.02089.pdf , searching for the string "cbor". I see some Chinese in context but it doesn't seem visible on the pages (or maybe I missed it).

[ 3.670 W] default QPdfSearchModelPrivate::doSearch - search string "cbor" not found in context "攀猀琀Ⰰ 儀甀漀爀愀Ⰰ 刀愀瀀䰀攀愀昀Ⰰ 爀攀䌀愀瀀琀栀愀Ⰰ 匀椀攀洀攀渀猀Ⰰ 唀戀攀爀 ㈀㌀ഀ\u0A00䈀匀伀一 䴀漀渀最漀䐀䈀ഀ\u0A00䌀䈀伀刀 䤀渀琀攀氀 ㈀㐀Ⰰ 䴀椀挀爀漀猀漀昀琀 ㈀㔀Ⰰ 伀甀琀昀漀砀 ㈀㘀Ⰰ 倀攀氀椀漀渀 ㈀㜀ഀ\u0A00䴀攀猀猀愀最攀倀愀挀欀 䄀洀愀稀漀"