Uncaught ValueError: mb_convert_encoding(): Argument #3 ($from_encoding)

I get this in an email after editing a page. The page is using GenerateBlocks, Block Visibility, and Gravity Forms. When I save on a WooCommerce site it takes a long time. The save is successful, but I get the error. I do not seem to get the error on non WooCommerce sites.

For reference, PHP 8.1 on Woo and 8.2 on other sites. All sites have GenerateBlocks, etc. All sites are running NGINX Redis, on GridPane.

array(78) { [0]=> string(6) “BASE64” [1]=> string(8) “UUENCODE” [2]=> string(13) “HTML-ENTITIES” [3]=> string(16) “Quoted-Printable” [4]=> string(4) “7bit” [5]=> string(4) “8bit” [6]=> string(5) “UCS-4” [7]=> string(7) “UCS-4BE” [8]=> string(7) “UCS-4LE” [9]=> string(5) “UCS-2” [10]=> string(7) “UCS-2BE” [11]=> string(7) “UCS-2LE” [12]=> string(6) “UTF-32” [13]=> string(8) “UTF-32BE” [14]=> string(8) “UTF-32LE” [15]=> string(6) “UTF-16” [16]=> string(8) “UTF-16BE” [17]=> string(8) “UTF-16LE” [18]=> string(5) “UTF-8” [19]=> string(5) “UTF-7” [20]=> string(9) “UTF7-IMAP” [21]=> string(5) “ASCII” [22]=> string(6) “EUC-JP” [23]=> string(4) “SJIS” [24]=> string(9) “eucJP-win” [25]=> string(11) “EUC-JP-2004” [26]=> string(18) “SJIS-Mobile#DOCOMO” [27]=> string(16) “SJIS-Mobile#KDDI” [28]=> string(20) “SJIS-Mobile#SOFTBANK” [29]=> string(8) “SJIS-mac” [30]=> string(9) “SJIS-2004” [31]=> string(19) “UTF-8-Mobile#DOCOMO” [32]=> string(19) “UTF-8-Mobile#KDDI-A” [33]=> string(19) “UTF-8-Mobile#KDDI-B” [34]=> string(21) “UTF-8-Mobile#SOFTBANK” [35]=> string(5) “CP932” [36]=> string(8) “SJIS-win” [37]=> string(7) “CP51932” [38]=> string(3) “JIS” [39]=> string(11) “ISO-2022-JP” [40]=> string(14) “ISO-2022-JP-MS” [41]=> string(7) “GB18030” [42]=> string(12) “Windows-1252” [43]=> string(12) “Windows-1254” [44]=> string(10) “ISO-8859-1” [45]=> string(10) “ISO-8859-2” [46]=> string(10) “ISO-8859-3” [47]=> string(10) “ISO-8859-4” [48]=> string(10) “ISO-8859-5” [49]=> string(10) “ISO-8859-6” [50]=> string(10) “ISO-8859-7” [51]=> string(10) “ISO-8859-8” [52]=> string(10) “ISO-8859-9” [53]=> string(11) “ISO-8859-10” [54]=> string(11) “ISO-8859-13” [55]=> string(11) “ISO-8859-14” [56]=> string(11) “ISO-8859-15” [57]=> string(11) “ISO-8859-16” [58]=> string(6) “EUC-CN” [59]=> string(5) “CP936” [60]=> string(2) “HZ” [61]=> string(6) “EUC-TW” [62]=> string(5) “BIG-5” [63]=> string(5) “CP950” [64]=> string(6) “EUC-KR” [65]=> string(3) “UHC” [66]=> string(11) “ISO-2022-KR” [67]=> string(12) “Windows-1251” [68]=> string(5) “CP866” [69]=> string(6) “KOI8-R” [70]=> string(6) “KOI8-U” [71]=> string(9) “ArmSCII-8” [72]=> string(5) “CP850” [73]=> string(16) “ISO-2022-JP-2004” [74]=> string(23) “ISO-2022-JP-MOBILE#KDDI” [75]=> string(7) “CP50220” [76]=> string(7) “CP50221” [77]=> string(7) “CP50222” }

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