Gaps in print after enclosing

After enclosing my printer I'm seeing some gaps in straight line extrusions.

Polymaker ASA at 260°C/105°C

Enclosure temp is around 48°C

Orbiter 2.0 + Phaetus Rapido UHF

Extruder is driven from a BTT EBB36 toolboard (reading MCU temp around 67°C)

Filament path is a 1.5 meter long, 2.5mm ID clear Bowden tube, no kinks and seems to have fairly low drag when moving filament by hand

I've only noticed this with ASA so far, and I never tried to print ASA without the enclosure, so maybe it's not really due to enclosing the printer.
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