Hello,
I'm reaching you, but I'm not sure this is an issue in the Gedmo side.

Since symfony/type-info 8.0.6 (this commit: symfony/type-info@4855cee), they also gather types thanks to @phpstan-template and @psalm-template.

For example in AbstractLogEntry class we can find this UnionType Loggable|object

/**
 * @phpstan-template T of Loggable|object

Which break in type-info UnionType class because we can't create an UnionType with both a class and object
(https://github.com/symfony/symfony/blob/8.1/src/Symfony/Component/TypeInfo/Type/UnionType.php#L74)

if (\in_array(TypeIdentifier::OBJECT, $builtinTypesIdentifiers, true) && \count(array_filter($this->types, fn (Type $t): bool => $t instanceof ObjectType))) {
    throw new InvalidArgumentException('Cannot create union with both "object" and class type.');
}

Thanks you