Sequence data corrupted in PF_Cmd_DO_DIALOG once PF_OutFlag2_SUPPORTS_THREADED_RENDERING is set

Thanks for your feedback, Jason. Yes, the sequence data are allocated and set in sequence setup. The same code has been working for years. The issue only occurse once I set PF_OutFlag2_SUPPORTS_THREADED_RENDERING. It's not that the data get corrupted in, but the handle I receive in in_data doesn't even seem to point to valid memory.

Here's a sketch of what we're doing

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PF_Cmd_SEQUENCE_SETUP

AEGP_SuiteHandler suites(in_data->pica_basicP);

...
size_t sequence_data_size = ...;

PF_Handle handle = suites.HandleSuite1()->host_new_handle(sequence_data_size);
AEX_WRAPPER_CHECKPTR(handle, PF_Err_OUT_OF_MEMORY)

// Lock the handle
auto aex_data = (pi1::aex_sequence_data*) suites.HandleSuite1()->host_lock_handle(handle);
AEX_WRAPPER_CHECKPTR(aex_data, PF_Err_INTERNAL_STRUCT_DAMAGED)

out_data->sequence_data = handle;
suites.HandleSuite1()->host_unlock_handle(handle);

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PF_Cmd_SEQUENCE_SETDOWN

AEGP_SuiteHandler suites(in_data->pica_basicP);

PF_Handle handle = in_data->sequence_data;
AEX_WRAPPER_CHECKPTR(handle, PF_Err_INTERNAL_STRUCT_DAMAGED)

...

suites.HandleSuite1()->host_dispose_handle(handle);

in_data->sequence_data = NULL;
out_data->sequence_data = NULL;

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PF_Cmd_SEQUENCE_RESETUP

AEGP_SuiteHandler suites(in_data->pica_basicP);

PF_Handle handle = in_data->sequence_data;
AEX_WRAPPER_CHECKPTR(handle, err)

auto aex_data = (pi1::aex_sequence_data*) suites.HandleSuite1()->host_lock_handle(handle);
if(aex_data)
{
// Read sequence data and transfer to underlying component
...

suites.HandleSuite1()->host_unlock_handle(handle);
out_data->sequence_data = in_data->sequence_data;

err = PF_Err_NONE;
}
else
{
err = SequenceSetup(in_data, out_data);
}

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PF_Cmd_SEQUENCE_FLATTEN

AEGP_SuiteHandler suites(in_data->pica_basicP);

PF_Handle handle = in_data->sequence_data;
AEX_WRAPPER_CHECKPTR(handle, err)

// NOTE: IT DOESN'T MAKE A DIFFERENCE, WHETHER I LOCK THE HANDLE HERE
auto aex_data = (pi1::aex_sequence_data*) DH(handle);

// Get state data from underlying components
size_t data_size = ...;
const void *data_ptr = ...;

::memcpy(aex_data->data, data_ptr, data_size);
out_data->sequence_data = handle;

I'm stuck 😕😕

I've tried both, i.e. directly accessing the handle via the DH() macro as well as locking/unlocking it via the data handle suite.

Both ways fail.