+1 Exactly the same here, no error or other indication, just everything empty when trying to use even the simplest shortcode in some plain Gutenberg block. Started initially with a fresh install of 6.3.6. Testwise tried a downgrade to 6.3.5 – suddenly everything works as expected – back to 6.3.6 – broken.
Strange enough in other similar environments meanwhile arrived at the same version (6.3.6) the thing is still working as it used to – but those installations have come a longer path from potentially initially older versions of ACF.
