Current update should fix such issue. If you don't get the OTA update, perform a factory reset and try again.
After each update please remember to perform a factory reset to avoid weird issues.
I got that update. No change but I seem to be getting 'fast charge' by using a 3rd party fast C type cable and the bundled Blackview charger plug. It looks like the bundled cable was an issue here. Strange, since I'd expect Blackview to bundle a decent fast Type C cable with their phone!