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he_heading_degT, le_heading_degT on both runways are empty strings.
Maybe extrapolate heading based on runway ident?
Submit ticket with ourairports.com

Feature request for intersection takeoff by reducing TODA. A slider would be an easy method for this

METAR wind is provided in magnetic heading, runway database is provided in true heading. The deviation can cause calculation deviance

icao does not accept text input after PR

"root":{4 items
"message":string"Network Error"
"name":string"Error"
"stack":string"Error: Network Error at e.exports (https://jbud.github.io/Flex-Calculator-TS/static/js/main.08d7db70.js:2:71618) at h.onerror (https://jbud.github.io/Flex-Calculator-TS/static/js/main.08d7db70.js:2:67271)"
"config":{11 items
"url":string"https://api.flybywiresim.com/metar/ZSPD?source=vatsim"
"method":string"get"
"headers":{...}1 item
"transformRequest":[...]1 item
"transformResponse":[...]1 item
"timeout":int0
"xsrfCookieName":string"XSRF-TOKEN"
"xsrfHeaderName":string"X-XSRF-TOKEN"
"maxContentLength":int-1
"maxBodyLength":int-1
"transitional":{...}3 items
}
}

It's not going to be in the initial release but it's coming

The calculation for V1 speed needs work, currently an arbitrary value is given to adjust the V1 speed based on runway wet or dry conditions. The ultimate goal is to calculate speeds at given distances and convert between knots and meters per second to calculate based on stopping distance the exact speed at which rejecting a takeoff will be unsafe, this will need to add a few seconds for human reaction, and engine spool-down while also taking account of reverser or inop reversers.

using toga distance compared to runway length, also make sure flex doesn't display anything below minFlex (~30) - ISA + OAT and run the toga check after

The headwind 339X has an MTOW of 242tonnes not 251tonnes
Source: https://www.simbrief.com/system/dispatch.php?sharefleet=352855_1650394989146

latest commit caused calculations for headwind's a339X to go invalid even on long runways.