Strange geophytic Ceropegia

[MLoos]

Hello All,
I know it's not the typical geophyte, but this Ceropegia is a conundrum.  I've been growing it for a year and it's not fitting the botanical description of C. occulta.  It came in as C. occulta DT6544 from seed, NARGS, planted 4/13/24.  Pictures taken 4/13/25 as I transplanted into separate pots.  The plants are dehydrated as I wanted them on the dry side to move.  Not my best pictures. As stems touched the ground, they rooted and went down to form rhizomes.  I've cut some off to grow out to see if they can be propagated in that manner.  C. occulta is said to be deciduous and this does not appear to lose stems.  Any ideas?
An addition: leaves are somewhat cordate/lanceolate, larger plants ~18cm across (not measured, I'll edit again, not at home now)  stem tip to stem tip, main tuber ~ 2cm when fully turgid
Thank you,
Michael
Interlaken, NY Zone 6