FontForge 228685, both Windows 10 and Linux (ArchLinux)
FontForge gives "[file] is not in a known format (or uses features of that format fontforge does not support, or is so badly corrupted as to be unreadable)".
Opening older versions of FontAwesome (5.15.4 for example) work as expected, so does opening the files in question with basically any other font tool including woff2_decompress.
https://fontawesome.com/v6/download
https://fontawesome.com/v5/download
$ woff2_info brands-v5.15.4.woff2
Processing brands-v5.15.4.woff2 => brands-v5.15.4.woff2
WOFF2Header
signature 0x774f4632
flavor 0x00010000
length 76736
numTables 13
reserved 0
totalSfntSize 133984
totalCompressedSize 76646
majorVersion 331
minorVersion 34340
metaOffset 0
metaLength 0
metaOrigLength 0
privOffset 0
privLength 0
TableDirectory starts at +48
Entry offset flags tag origLength txLength
0 48 0x3f FFTM 28
1 54 0x1a GDEF 30
2 56 0x06 OS/2 96
3 58 0x00 cmap 1530
4 61 0x11 gasp 8
5 63 0x0a glyf 122300 95906
6 70 0x01 head 54
7 72 0x02 hhea 36
8 74 0x03 hmtx 1836
9 77 0x0b loca 920 0
10 81 0x04 maxp 32
11 83 0x05 name 1413
12 86 0x07 post 5469
TableDirectory ends at +89
$ woff2_info brands-v6.2.0.woff2
Processing brands-v6.2.0.woff2 => brands-v6.2.0.woff2
WOFF2Header
signature 0x774f4632
flavor 0x00010000
length 107460
numTables 10
reserved 0
totalSfntSize 180184
totalCompressedSize 107386
majorVersion 770
minorVersion 256
metaOffset 0
metaLength 0
metaOrigLength 0
privOffset 0
privLength 0
TableDirectory starts at +48
Entry offset flags tag origLength txLength
0 48 0x01 head 56
1 50 0x02 hhea 36
2 52 0x04 maxp 32
3 54 0x06 OS/2 96
4 56 0x03 hmtx 2052
5 59 0x00 cmap 4664
6 62 0xca glyf 170104
7 66 0xcb loca 2056
8 69 0x05 name 1056
9 72 0x07 post 32
TableDirectory ends at +74
FontForge 228685, both Windows 10 and Linux (ArchLinux)
FontForge gives "[file] is not in a known format (or uses features of that format fontforge does not support, or is so badly corrupted as to be unreadable)".
Opening older versions of FontAwesome (5.15.4 for example) work as expected, so does opening the files in question with basically any other font tool including
woff2_decompress.https://fontawesome.com/v6/download
https://fontawesome.com/v5/download