What do the messages contain? Just plain text? or do they contain weird characters and other non-ASCII data? You say it is 100% reproducible and your provider said the messages get delivered, so you need to root around in your phone, they are stored somewhere. I remember one user had to do that to figure out why messages seemingly got lost.
edit: one possible directory is /var/lib/ofono.
Here are two related threads:
REPRODUCIBILITY: Consistent with some senders (don’t know the condition)
OS VERSION: 4.5.19
HARDWARE: Sony Xperia 10 III
UI LANGUAGE: English (UK)
REGRESSION: Unknown
REPRODUCIBILITY: once a week or so, not predictable, no clear STR.
OS VERSION: currently 4.6.0.11, but I’ve seen this problem for many years.
HARDWARE: currently Xperia 10 III, previously observed at least on Xperia XA2 and Xperia X.
UI LANGUAGE: English.
REGRESSION: no.
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