odd mag side bearing

i have just stripped down a SIL 150 motor..
i was surprised not to see a bearing collar on the crankshaft, on further inspection there was a standard 6305 caged roller bearing in the mag housing..
is this a thing? or (as i suspect) a dodgy rebuild?
i was surprised not to see a bearing collar on the crankshaft, on further inspection there was a standard 6305 caged roller bearing in the mag housing..
is this a thing? or (as i suspect) a dodgy rebuild?