Bi2Te3XML test needs considerably less time than Bi2Te3.
Running ctest produced this output:
Start 29: FLEUR_SOC:Bi2Te3
29/66 Test #29: FLEUR_SOC:Bi2Te3 ................. Passed 172.60 sec
Start 30: FLEUR_SOC:Bi2Te3XML
30/66 Test #30: FLEUR_SOC:Bi2Te3XML .............. Passed 108.44 sec
[...]
Start 62: FLEUR_SOC_MPI:Bi2Te3
62/66 Test #62: FLEUR_SOC_MPI:Bi2Te3 ............. Passed 177.03 sec
Start 63: FLEUR_SOC_MPI:Bi2Te3XML
63/66 Test #63: FLEUR_SOC_MPI:Bi2Te3XML .......... Passed 106.93 sec
The large differences in the runtime for the two tests look suspicious to me. The reason is unclear. Both tests seem to do what they are supposed to do.
This should be investigated further.