Are Splices Allowed in Breaker Panel?

So basically yes, splices are FINE in a breaker panel.

Can you splice wire in a breaker box?

Wire splices can be done inside a panel, and often are necessary to repair a double-tap at a breaker (two wires under one breaker connection) using a short wire called a “pigtail,” extend wires that are a little too short when a panel is replaced, or as part of moving circuits from a main panel to a subpanel for a ...

Are pigtails allowed in breaker box?

Pigtails in a panel are fine...

Wire-splicing and pigtailing within a loadcenter cabinet (panel enclosure) is expressly permitted by NEC 312.8(A), and is quite safe (provided the splices are made up properly, of course): (A) Splices, Taps, and Feed-Through Conductors.