Sen2cor 2.8 fails systematically

All products that I tried to process with sen2cor_2.8 and downloaded since March 30, 2021 generate the same error: AttributeError: ‘bool’ object has no attribute 'SPACECRAFT_NAME’

These products can be perfectly corrected when processed with sen2cor 2.5.5

I´ve seen the solution is to use sen2cor 2.9.0 (reported in New REFINED L1C tiles do not process with Sen2Cor 2.8)