M8029 (Instruction execution complete flag) is shared with multiple instructions.
To obtain an execution completion result of a specific instruction, insert a contact for M8029 directly under the corresponding instruction in a program.
For an example of a program, refer to the following. Section 6.5.2 in the FX3S/FX3G/FX3GC/FX3U/FX3UC Series Programming Controllers Programming Manual [Basic & Applied Instruction Edition]