Accidentally baked flatbread with oxygen absorber -- is flatbread safe to eat?
Given that you have identified the oxygen scavenger as a ZPT-type AGELESS device, I believe the active ingredient is mainly iron oxide, rust, which isn't inherently harmful.  However I do not know what the packaging material is made from.

AGELESS ZPT-type:



I did find some data on the Mitsuibishi website for AGELESS, stating that some types are alright when microwaved, but there were no direct references to direct heating.

If it were me, I would remove the area around the patch and eat it, but I am not an expert and I would recommend that you contact them directly to be sure.

Tel: 212-687-9030 (US)
Email: AGELESS@mgc-a.com