Remove association of file extension to app (Open With to <None>)

Software
1

I have accidentally associated an extension with an App. I have downloaded and installed GitHub - Lord-Kamina/SwiftDefaultApps: Replacement for RCDefaultApps, written in Swift. and I have identified the UTI:


$  mdls -name kMDItemContentType -name kMDItemContentTypeTree -name kMDItemKind run.pipeline.bemovi
kMDItemContentType     = "dyn.ah62d4rv4ge80e3prr75gw"
kMDItemContentTypeTree = (
    "public.item",
    "dyn.ah62d4rv4ge80e3prr75gw",
    "public.data"
)
kMDItemKind            = "Document"

But I can not find the UTI dyn.ah62d4rv4ge80e3prr75gw in the Uniform Type Identifiers tab.

I am using Catalina.

Am I missing something - is there a different way of removing the association? I do NOT want to associate it with anything else.