Regression test AWAGun-Trackback-1 fails

The AWAGun-Trackback-1 regression test fails (by a small difference in energy):

http://amas.web.psi.ch/opal/regressionTests/master/results_2020-08-04.xml

rms_x	avg	1e-05	5.111029460895303e-08	
rms_y	avg	1e-05	5.1156002121029413e-08	
rms_s	avg	1e-05	5.884942548195067e-07	
emit_x	avg	1e-05	1.1452361821547997e-09	
emit_y	avg	1e-05	1.1531791285653276e-09	
emit_s	avg	1e-05	2.079697542474211e-09	
energy	avg	1e-05	0.0003093416526873199	

This is likely due to src!413 (merged) and src!414 (merged), so probably also on 2.4.