stepf does not skip splits with succesfull nodes

[virgil-serbanuta]

To reproduce:

Versions:

$ kompile --version test.k --backend haskell && kprove proof.k --haskell-backend-command 'kore-repl --version'
K version:    v5.3.60-0-gbf6c9cb9d0
Build date:   Wed May 25 19:59:21 EEST 2022
Kore version 0.60.0.0
Git:
  revision:     9767a2a2598f2f9e3ad969ac3ba0d81d1a26a9aa
  branch:       HEAD
  last commit:  Fri May 20 09:13:31 2022 -0600
Welcome to the Kore Repl! Use 'help' to get started.
...

test.k

module TEST
  imports BOOL
  imports INT

  syntax KItem ::= split(KItem) | "a" | "b"

  rule split(_:Int) => a
  rule split(K:KItem) => b ensures notBool isInt(K)

  rule a => .K
endmodule

proof.k

module PROOF
  imports TEST

  claim split(A:KItem) => .K requires isInt(A)
endmodule

Command line:

kompile --version test.k --backend haskell && kprove proof.k --haskell-backend-command 'kore-repl --version'

Repl:

step
stepf

Expected result: the current node should be '1'.
Actual result: the current node is '0'.