Why does Pihole v5 have less domains to block than v4?

I have a v4 and v5 server running, both have the exact same blocklists (copy/paste) and are updated both on the same time (5 mins ago).

v4 has 1,482,938 domains on blocklist
v5 has 1,210,598 domains on blocklist

How is that possible?

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The algorithm to remove invalid domains from adlists has been improved.
Even when v4 shows more domains they might have not worked or created false-positives (overblocking)

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Thanks for the fast and clear answer!

The output of pihole -g will show details for each blocklist and can help you eliminate incorrectly formatted lists.