In case it helps you diagnose the issue, I discovered a workaround for this issue with the following steps:
To recover the 'stuck' Mlock-91 Mag
1. Open inventory, select 'to hands/swap' on the Mlock-91 pistol
2. Move cursor to the Mlock-91 magazine slot and press 'square' to move the currently installed mag to inventory
3. Move cursor to the vicinity panel and highlight 'stuck' Mlock-91 magazine in the Patrol Jacket on the ground and select 'Combine' to install it into the Mlock-91's magwell
To recover the 'stuck' 7.62x39mm rounds
1. Open inventory and select 'to hands/swap' on a fully loaded (30/30 rounds) KA-M magazine
2. Close inventory
3. Unload rounds from KA-M magazine
4. Open inventory
5. Move cursor to 7.62x39mm rounds 'stuck' in Patrol Jacket and select 'Combine'
6. Load 'stuck' 7.62x39mm into KA-M magazine
7. Open inventory and return KA-M magazine loaded with previously stuck 7.62x39mm to inventory
8. Repeat steps 1-7 for 7.62x39mm tracer rounds.
Thank you, and great work on 1.10.