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You should turn job control on with set -m in your .bashrc before starting tmux.

bash runs startup files like .bashrc with job control disabled. From shell.c:

#if defined (JOB_CONTROL)
  /* Startup files should be run without job control enabled. */
  old_job_control = interactive_shell ? set_job_control (0) : 0;
#endif

Please notice that C-b C-z does not set tmux in the background by itself; absent job control in the upper shell, the SIGTSTP signal tmux sends itself will just cause it to stop; the tmux process will still be in the foreground process group of the terminal (despite the deceptive switching from the alternate screen with the the exit_ca_mode/rmcup/te escape on some terminal emulators like xterm)

You should turn job control on with set -m in your .bashrc before starting tmux.

Bash runs startup files like .bashrc with job control disabled. From shell.c:

#if defined (JOB_CONTROL)
  /* Startup files should be run without job control enabled. */
  old_job_control = interactive_shell ? set_job_control (0) : 0;
#endif

Please notice that C-b C-z does not set tmux in the background by itself; absent job control in the upper shell, the SIGTSTP signal tmux sends itself will just cause it to stop; the tmux process will still be in the foreground process group of the terminal (despite the deceptive switching from the alternate screen with the the exit_ca_mode/rmcup/te escape on some terminal emulators like xterm)

You should turn job control on with set -m in your .bashrc before starting tmux.

bash runs startup files like .bashrc with job control disabled. From shell.c:

#if defined (JOB_CONTROL)
  /* Startup files should be run without job control enabled. */
  old_job_control = interactive_shell ? set_job_control (0) : 0;
#endif

You should turn job control on with set -m in your .bashrc before starting tmux.

bash runs startup files like .bashrc with job control disabled. From shell.c:

#if defined (JOB_CONTROL)
  /* Startup files should be run without job control enabled. */
  old_job_control = interactive_shell ? set_job_control (0) : 0;
#endif

Please notice that C-b C-z does not set tmux in the background by itself; absent job control in the upper shell, the SIGTSTP signal tmux sends itself will just cause it to stop; the tmux process will still be in the foreground process group of the terminal (despite the deceptive switching from the alternate screen with the the exit_ca_mode/rmcup/te escape on some terminal emulators like xterm)

bash runs startup files with job control disabled. From shell.c:

#if defined (JOB_CONTROL)
  /* Startup files should be run without job control enabled. */
  old_job_control = interactive_shell ? set_job_control (0) : 0;
#endif

You can try adding set -m before starting tmux in your .bashrc and it will probably work; but frankly, I'm not completely clear about the consequences of it.

You should turn job control on with set -m in your .bashrc before starting tmux.

bash runs startup files like .bashrc with job control disabled. From shell.c:

#if defined (JOB_CONTROL)
  /* Startup files should be run without job control enabled. */
  old_job_control = interactive_shell ? set_job_control (0) : 0;
#endif