I think that Tamiya did this on purpose. The inner doors appear to be added in the Mossies with pressurized cabin, in order to help sealing the cockpit interior.
BTW, the 'T9+XB' was most likely never flown by the Germans, with their markings added only for the purpose of static display during a presentation of captured Allied aircraft at Rechlin, on September 3rd, 1943. It is believed that this aircraft was a PR.IV, DZ466, of No. 540 Sqn., which failed to return from a recon sortie on February 20th, 1943.