I have an automatic chicken cooker. However, the grow-up chickens seem to not immediately take damage from lava when it is dispensed from a dispenser, they just sit there, heads in lava and not a single point of damage do they take, at least for half a minute or so.
I do have a half-slab resting on the block where the chickens rest,so the grow-up chickens should be taking damage...
However, they do take damage from lava manually placed.
Below you can see a shot of the chicken's head clearly in lava, but no damage being taken.
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This is almost certainly a replication of https://bugs.mojang.com/browse/MCPE-31481
Try removing any block over the lava.
Thanks for the report, however this has been reported previously as MCPE_31481 and this ticket has been resolved as a duplicate of that issue. If you have any new information, please comment on that ticket. If didn't this time, please search to see if an issue has already been reported before reporting.
Note: This has been fixed in a beta version and should hopefully be fixed soon on the main release. (No date can be provided at this time)
I can add that all other mobs (farmable ones, anyway) seem to take damage from the dispensed lava.