iOS Bug with file functions in iOS? Creating a file does not seem to work, "no such file" error.

[Guest]

I check for the existence of a file and, if it does not exist, create it, like so:

global.privacy_consent = false;
if (!file_exists("privacy_consent.bhsl"))
    {
    show_debug_message("* Privacy_consent.bhsl did not exist, creating it.");
    var privacy_consent_map = ds_map_create();
    privacy_consent_map[? "consent"] = false;
    var privacy_consent_map_string = ds_map_write(privacy_consent_map);
    var f = file_text_open_write("privacy_consent.bhsl");
    file_text_write_string(f, privacy_consent_map_string);
    file_text_close(f);
    ds_map_destroy(privacy_consent_map);
    }
if (file_exists("privacy_consent.bhsl"))
    {
    show_debug_message("* Reading privacy_consent.bhsl.");
    var f = file_text_open_read("privacy_consent.bhsl");
    show_debug_message("* Should have successfully opened privacy_consent.bhsl.");

    var privacy_consent_map_string = file_text_read_string(f);
    var privacy_consent_map = ds_map_create();
    ds_map_read(privacy_consent_map, privacy_consent_map_string);
    global.privacy_consent = privacy_consent_map[? "consent"];
    file_text_close(f);
    ds_map_destroy(privacy_consent_map);
    }

But running on an iPad using the VM and debugger, I get these errors and this output:

2019-07-24 10:37:44.615800-0700 BHSL[251:4819] * Privacy_consent.bhsl did not exist, creating it.
2019-07-24 10:37:44.619488-0700 BHSL[251:4819] * Reading privacy_consent.bhsl.
2019-07-24 10:37:44.619724-0700 BHSL[251:4819] Unable to open file  (No such file or directory)
2019-07-24 10:37:44.621225-0700 BHSL[251:4819] * Should have successfully opened privacy_consent.bhsl.

When I reboot the iPad (to close the game) and try to open the game, it hangs on a black screen rather than running correctly.

(I'm getting this problem with all my file functions, this was just the simplest example I had to copy and paste.)