Using split file driver in conjunction with setting mdc config caused failure

Reported through Helpdesk by Dr. Werner Benger:

This is just to let you know that using the split file driver

H5Pset_fapl_multi(fapl_id, memb_map, memb_fapl,
memb_name, memb_addr, 0);

in conjunction with

H5AC_cache_config_t mdc_config;
mdc_config.version = H5AC__CURR_CACHE_CONFIG_VERSION;
H5Pget_mdc_config(fapl_id, &mdc_config);

mdc_config.initial_size = 32\*1024\*1024;
mdc_config.max_size = 32\*1024\*1024;
mdc_config.min_size = 1024\*1024;

mdc_config.version = H5AC__CURR_CACHE_CONFIG_VERSION;
H5Pset_mdc_config(fapl_id, &mdc_config);

leads to a failure in HDF5 **1.14.4-3**, see the attached [logfile](https://github.com/user-attachments/files/20750550/logfile.txt) for details of the error stack.

I solved the problem by not setting the mdc config and it works that way, but in case this issue is not known and easy to fix in HDF5, I let you know. It works fine without the split file driver, so it looks like some internal bug, unless it is some cryptic intentional behavior?