@User Hi, true those environment variables are from openlane,

MAGIC_DRC_USE_GDSA flag to choose whether to run the magic DRC checks on GDS or not. If not, then the checks will be done on the DEF/LEF. 1 = GDS, 0 = DEF/LEF
(Default: 1 )
MAGIC_EXT_USE_GDSA flag to choose whether to run the magic extractions on GDS or DEF/LEF. If GDS was used Device Level LVS will be run. Otherwise, blackbox LVS will be run. 1 = GDS, 0 = DEF/LEF
(Default: 0 )

Regarding that, the GDS is generated, but the openlane does not continue in that case. But is very strange because some times work and finish sometimes not