fundchannel(and other functions?) spend immature coinbase outputs

[instagibbs]

Mined directly into my wallet on regtest. Seems like something that should be avoided if possible just as an annoyance.

{
   "code": 303,
   "message": "Error broadcasting funding tx: error code: -26\\\\nerror message:\\\\nbad-txns-premature-spend-of-coinbase, tried to spend coinbase at depth 18. Unsent tx discarded 02000000000101e2cda28e18c7f3aed67ad1f602af3d05b3e8defeda960072f0128db1174b1c280000000000fdffffff02a08601000000000022002047d39ed3ae6ebcec8f34be245ba579605d2073bbdbde27cfddbe2cdd2b1cfea1c66a042a0100000016001411a9312852c59f4ffa4678dea7448f6ade462e9e0246304302200f27ca1bab7bc9878a1f48e1731c57eb6ade326c30240facf39ec943c9d697ce021f35ac0cb95bb4b1794307c85a9153f8c561a1fccdc3b196ee08aa66f5af4067012102f8fdb6ded596fb1b73059eceda5f59f28739479419adfdfa7dec6d39a2bd2e9e66000000.",
   "data": {
      "id": "036a76e9bebfc101e93c6034150759844a0d10cc0012f4fdba19bfd3b94f963b10",
      "method": "openchannel_signed"
   }
}