If a three-cornered tallit has three tzitzit placed on it, and then a fourth corner is created and tzitzit added, are all four tzitzit valid?

Tzitzit & TefillinTzitzitValidity

Synopsis

If tzitzit are made on a three-cornered garment and then a fourth corner is added and tzitzit placed on it, all tzitzit are invalid due to the rule of 'ta'aseh v'lo min ha'asuy' (you shall make, not from that which is already made). All four must be undone and retied.

Early Acharonim
Lenient
Strict
Lesser cited
Major authority

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