Colon in UPROPERTY category invalidates iterative build

The presence of a colon ':' character in the category string of a UPROPERTY will cause iterative cooking to generate the following error:
Found unparsable ini setting Windows.EditorPerProjectUserSettings:DetailCategories:EQSTestingPawn_C.Character Movement: Walking:0 for platform mac, invalidating cook.
The above is one such example from UCharacterMovementComponent on a mac build, though it would happen regardless of component or platform.

The cause appears to be that UCookOnTheFlyServer::GetCookedIniVersionStrings assumes that each string will be delimited with exactly 3 colons as follows:
FileName:SectionName:ValueName:ValueIndex

This assumption is broken by UPROPERTY categories that have a colon in their name, such as found in UCharacterMovementComponent::MaxStepHeight which is declared as:

/** Maximum height character can step up */
UPROPERTY(Category="Character Movement: Walking", EditAnywhere, BlueprintReadWrite, meta=(ClampMin="0", UIMin="0"))
float MaxStepHeight;

Include a colon in a uproperty and see if iterative cookign works.